Voids were removed from the credit shop to stimulate more activity, and to reduce the principle of credit farming (which has been bannable). This worked. They won't be added back.

As for things like Void Seviper, Void Zekrom and those that can't be obtained any more, the idea was that those would be introduced through the raffles. Which worked when they ran, but they need a dev to keep them going. This is what needs to be looked at.